John Voelcker Jan 30, 2017 Follow John Add to circle General Motors Brownstown Township factory for assembly of Chevrolet Volt battery packs Enlarge Photo Battery-electric cars are being delivered in volume today, but planned hydrogen fuel-cell vehicles from major automakers are on a more gradual timeframe. This morning, General Motors and Honda jointly announced that the two companies would establish a joint venture to produce hydrogen fuel-cell systems for future products from each carmaker. Located within GM's existing battery plant in Brownstown, Michigan, it will start mass production "around 2020," the companies said. DON'T MISS: Honda, GM To Build Factory For Fuel-Cell Production By 2025 (Jan 2016) Formally dubbed Fuel Cell System Manufacturing LLC, the new unit is funded equally by the two makers, each of which has contributed to its total cost of $85 million. Hond...